The sensor is S1 in this alarm that we found in a Radio Electronics magazine from May 1971. Several sensors can be used in series. The SCR supports equivalents from the 106 series.
This traditional configuration of a white noise generator that uses the junction of a transistor with a...
This circuit is a source that allows antenna boosters to be powered by the signal cable itself, as shown...
We found this code key or coded keyboard in a publication from the 90s. The circuit uses...